Infiniti QX56 (Z62). Manual - part 328

DAS

C1A05 BRAKE SW/STOP LAMP SW

DAS-349

< DTC/CIRCUIT DIAGNOSIS >

[LDW & LDP]

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C1A05 BRAKE SW/STOP LAMP SW

DTC Logic

INFOID:0000000006228188

DTC DETECTION LOGIC

NOTE:
If DTC “C1A05” is detected along with DTC “U1000”, first diagnose the DTC “U1000”. Refer to 

DAS-374,

"ADAS CONTROL UNIT : DTC Logic"

. 

Diagnosis Procedure

INFOID:0000000006228189

1.

CHECK SELF-DIAGNOSIS RESULTS

1.

Perform “All DTC Reading” with CONSULT-III. 

2.

Check if the “U1000” is detected other than “C1A05” in “Self Diagnostic Result” of “ICC/ADAS”. 

Is “U1000” detected?

YES

>> Perform the CAN communication system inspection. Repair or replace the malfunctioning parts.

Refer to 

DAS-374, "ADAS CONTROL UNIT : DTC Logic"

. 

NO

>> GO TO 2.

2.

CHECK STOP LAMP SWITCH AND ICC BRAKE SWITCH

Check that “STOP LAMP SW” and “BRAKE SW” operate normally in “DATA MONITOR” of “ICC/ADAS”. 

Is the inspection result normal?

YES

>> GO TO 3.

NO-1

>> When “BRAKE SW” operation is malfunctioning: GO TO 4.

NO-2

>> When “STOP LAMP SW” operation is malfunctioning: GO TO 9.

3.

CHECK STOP LAMP SWITCH

Check that “STOP LAMP SW” operate normally in “DATA MONITOR” of “ABS”. 

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> GO TO 9.

4.

CHECK ICC BRAKE SWITCH INSTALLATION

1.

Turn ignition switch OFF.

2.

Check ICC brake switch for correct installation. Refer to 

BR-7, "Inspection and Adjustment"

. 

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Adjust ICC brake switch installation. Refer to 

BR-7, "Inspection and Adjustment"

. 

5.

ICC BRAKE SWITCH INSPECTION

1.

Disconnect ICC brake switch connector. 

2.

Check ICC brake switch. Refer to 

DAS-352, "Component Inspection (ICC Brake Switch)"

. 

Is the inspection result normal?

DTC

(On board dis-

play)

Trouble diagnosis 

name

DTC detecting condition

Possible causes

C1A05

(5)

BRAKE SW/STOP L 
SW

A mismatch between a stop lamp switch signal 
and a ICC brake switch signal received from 
ECM and a stop lamp signal received from the 
ABS actuator and electric unit (control unit) con-
tinues for 10 seconds or more with vehicle 
speeds at approximately 40 km/h or more

• Stop lamp switch circuit
• ICC brake switch circuit
• Stop lamp switch
• ICC brake switch
• Incorrect stop lamp switch installa-

tion

• Incorrect ICC brake switch installa-

tion

• ECM
• ABS actuator and electric unit (con-

trol unit)

DAS-350

< DTC/CIRCUIT DIAGNOSIS >

[LDW & LDP]

C1A05 BRAKE SW/STOP LAMP SW

YES

>> GO TO 6.

NO

>> Replace ICC brake switch.

6.

CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT

1.

Turn the ignition switch ON.

2.

Check voltage between ICC brake switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair the harnesses or connectors.

7.

CHECK HARNESS BETWEEN ICC BRAKE SWITCH AND ECM

1.

Turn ignition switch OFF

2.

Disconnect ECM connector.

3.

Check for continuity between ICC brake switch harness connector and ECM harness connector. 

4.

Check for continuity between ICC brake switch harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair the harnesses or connectors.

8.

PERFORM SELF-DIAGNOSIS OF ECM

1.

Connect all connectors again if the connectors are disconnected. 

2.

Turn ignition switch ON.

3.

Perform “All DTC Reading”. 

4.

Check if any DTC is detected in “Self Diagnostic Result” of “ENGINE”. Refer to 

EC-98, "DTC Index"

.

Is any DTC detected?

YES

>> Repair or replace the malfunctioning parts identified by the self-diagnosis result. 

NO

>> Replace the ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

.

9.

CHECK STOP LAMP SWITCH INSTALLATION

1.

Turn ignition switch OFF.

2.

Check stop lamp switch for correct installation. Refer to 

BR-7, "Inspection and Adjustment"

. 

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Adjust stop lamp switch installation. Refer to 

BR-7, "Inspection and Adjustment"

. 

10.

STOP LAMP SWITCH INSPECTION

1.

Disconnect stop lamp switch connector. 

2.

Check stop lamp switch. Refer to 

DAS-352, "Component Inspection (Stop Lamp Switch)"

. 

Is the inspection result normal?

YES

>> GO TO 11.

Terminals

Voltage

(Approx.)

(+)

(-)

ICC brake switch

Ground

Connector

Terminal

E68

1

Battery voltage

ICC brake switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

E68

2

E80

147

Existed

ICC brake switch

Ground

Continuity

Connector

Terminal

E68

2

Not existed

DAS

C1A05 BRAKE SW/STOP LAMP SW

DAS-351

< DTC/CIRCUIT DIAGNOSIS >

[LDW & LDP]

C

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NO

>> Replace stop lamp switch. 

11.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1.

Turn the ignition switch ON.

2.

Check voltage between stop lamp switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Repair the harnesses or connectors.

12.

CHECK HARNESS BETWEEN STOP LAMP SWITCH AND ECM

1.

Turn ignition switch OFF

2.

Disconnect ECM, rear combination lamp and high-mounted stop lamp connectors.

3.

Check for continuity between stop lamp switch harness connector and ECM harness connector. 

4.

Check for continuity between stop lamp switch harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Repair the harnesses or connectors.

13.

CHECK HARNESS BETWEEN STOP LAMP SWITCH AND ABS ACTUATOR AND ELECTRIC UNIT

(CONTROL UNIT)

1.

Disconnect ABS actuator and electric unit (control unit) connector.

2.

Check for continuity between stop lamp switch harness connector and ABS actuator and electric unit
(control unit) harness connector. 

3.

Check for continuity between stop lamp switch harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> Repair the harnesses or connectors.

Terminals

Voltage

(Approx.)

(+)

(-)

Stop lamp switch

Ground

Connector

Terminal

E115

1

Battery voltage

3

Stop lamp switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

E115

2

E80

158

Existed

Stop lamp switch

Ground

Continuity

Connector

Terminal

E115

2

Not existed

Stop lamp switch

ABS actuator and electric 

unit (control unit)

Continuity

Connector

Terminal

Connector

Terminal

E115

4

E36

17

Existed

Stop lamp switch

Ground

Continuity

Connector

Terminal

E115

4

Not existed

DAS-352

< DTC/CIRCUIT DIAGNOSIS >

[LDW & LDP]

C1A05 BRAKE SW/STOP LAMP SW

14.

PERFORM SELF-DIAGNOSIS OF ECM

1.

Connect all connectors again if the connectors are disconnected. 

2.

Turn ignition switch ON.

3.

Perform “All DTC Reading”. 

4.

Check if any DTC is detected in “Self Diagnostic Result” of “ENGINE”. Refer to 

EC-98, "DTC Index"

.

Is any DTC detected?

YES

>> Repair or replace the malfunctioning parts identified by the self-diagnosis result. 

NO

>> GO TO 15.

15.

PERFORM SELF-DIAGNOSIS OF ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

Check if any DTC is detected in “Self Diagnostic Result” of “ABS”. Refer to 

BRC-51, "DTC Index"

. 

Is any DTC detected?

YES

>> Repair or replace the malfunctioning parts identified by the self-diagnosis result. 

NO

>> Replace the ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

.

Component Inspection (ICC Brake Switch)

INFOID:0000000006228190

1.

CHECK ICC BRAKE SWITCH

Check for continuity between ICC brake switch terminals. 

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace ICC brake switch. 

Component Inspection (Stop Lamp Switch)

INFOID:0000000006228191

1.

CHECK STOP LAMP SWITCH

Check for continuity between stop lamp switch terminals. 

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace stop lamp switch. 

Terminal

Condition

Continuity

1

2

When brake pedal is depressed

Not exist-

ed

When brake pedal is released

Existed

Terminal

Condition

Continuity

1

2

When brake pedal is depressed

Existed

When brake pedal is released

Not exist-

ed

3

4

When brake pedal is depressed

Existed

When brake pedal is released

Not exist-

ed